Burr



'ct. H. WELLS Sept. 16, 192%.

BURR

Filed July 14. 1923 INVENTOR A'I'I'DRNEY WITNESS:

Patented Sept. 16, 1924.

PATENT OFFICE.

CLAUD H. WELLS, OF GOUVERNEUR, NEW YORK.

BURR.

Application filed July 14, 1923. Serial No. 651,548.

To all whom it may concern:

Be it known that I, CLAUD H. VVELLs, a citizen of the United States, residing at Gouverneur, in the county of St. Lawrence and State of New York, have invented new and useful Improvements in Burrs, of which the following is a specification.

My present invention has reference to burrs for facing pulp mill stones, and the W object of my invention is to produce a burr comprising a cylindrical body having perpheral teeth arranged in series, each tooth being of a pyramidal formation and the cylindrical body having its outer face hetween the series of teeth grooved in both directions whereby the stone will be faced without breakage and the necessary grooved or roughened face will be provided thereon.

The drawing which accompanies and which forms part of this application, il-

lustrates my improvement.

1n the drawing Figure 1 is a perspective view of the improvement with parts broken away and 7 parts in section.

Figure 2 is a sectional View" on the line 22 of Figure 1.

Figure 3 is a fragmentary perspective view to more clearly illustrate the formation of the teeth and the grooves between the lower walls of the teeth.

The body of my improvement is in the natureof a steel cylinder, and is indicated by the numeral 1. On its outer face the cylinder is integrally formed with closely related circumferentially disposed series of teeth. The teeth are indicated by the nu meral 2, and each tooth is of a pyramidal formation. The body 1 has its outer face be tween the series of teeth 2 formed with continuous rounded circumferential grooves 3 and similar continuoustransverse grooves 4.

With my improvement no sharpened surface is provided between the series of teeth, as is true with respect to burr teeth arranged in series whose lower walls merge together. The grooves 3 and 4 prevent the crumpling or breaking of the stone which is faced by the burr and also provide the same with the necessary roughened sur 550 face to properly act on the pulp.

It is thought that the foregoing description, when taken in connection with the drawing will fully set forth the construction and advantages of my improvement to those skilled in the art to which such inventions relate.

Having described the claim A burr for facing pulp mill stones, comprising a cylindricalbody having aligning circumferential and transverse series of teeth, each of a pyramidal formation, said body having its outer face between the teeth grooved both circumferentially and transversely, and the walls of said grooves being rounded. a

In testimony whereof I aflix my signature.

CLAUD H. WELLS.

invention, I 

